From patchwork Wed May 18 16:44:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sai Prakash Ranjan X-Patchwork-Id: 12853872 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 92613C433F5 for ; Wed, 18 May 2022 16:45:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240434AbiERQpi (ORCPT ); Wed, 18 May 2022 12:45:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45818 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240459AbiERQpZ (ORCPT ); Wed, 18 May 2022 12:45:25 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B04F1FC2FE; Wed, 18 May 2022 09:45:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1652892324; x=1684428324; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=K4dbklDrBN0007czk1A8uvXlWciPzpruZ8ED1Gjwyzc=; b=LJ+B/ZkskDX2156zuKVxqDEaImvDCpAj5fbEdhzqpC12XxaICUxDDVKT AInhI2J7OnRSj42hXHLzK16i6uAhINzC7E7jqiPIhIWP08sxUABC8a2rC A8/rnAN6mn1quzMHQBYQWJd34QgfEC64J5jB+3Zgr4GU6Ko6FJQjpBoLU k=; Received: from ironmsg08-lv.qualcomm.com ([10.47.202.152]) by alexa-out.qualcomm.com with ESMTP; 18 May 2022 09:45:24 -0700 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg08-lv.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2022 09:45:23 -0700 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 18 May 2022 09:45:14 -0700 Received: from blr-ubuntu-253.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.22; Wed, 18 May 2022 09:45:10 -0700 From: Sai Prakash Ranjan To: , , CC: , , , , , , , , , , Sai Prakash Ranjan Subject: [PATCHv15 6/9] KVM: arm64: Add a flag to disable MMIO trace for nVHE KVM Date: Wed, 18 May 2022 22:14:15 +0530 Message-ID: X-Mailer: git-send-email 2.33.1 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add a generic flag (__DISABLE_TRACE_MMIO__) to disable MMIO tracing in nVHE KVM as the tracepoint and MMIO logging symbols should not be visible at nVHE KVM as there is no way to execute them. It can also be used to disable MMIO tracing for specific drivers. Signed-off-by: Sai Prakash Ranjan --- arch/arm64/kvm/hyp/nvhe/Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index f9fe4dc21b1f..87d22a18b7a5 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -4,7 +4,12 @@ # asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS + +# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as +# there is no way to execute them and any such MMIO access from nVHE KVM +# will explode instantly (Words of Marc Zyngier). So introduce a generic flag +# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM. +ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__ hostprogs := gen-hyprel HOST_EXTRACFLAGS += -I$(objtree)/include